Saving Whats Already Broken (NM x Reader)

Y/n is a potions healer, over a couple days Nightmare turns to the usual Canon self, but he doesnt leave without you, he keeps you with him in his castle, using potions and typically nothing wrong happens, until the star sanses try to save you, on many occasions, Second x reader, first one is in one of my first books...

nightmare Sans xEvil reader (Completed)

you were once and happy child but then your mother died and your father commits suicide when you were 12 right now you deal drugs and kill people just for fun and you can feel something then you meant nightmare in dreamtale you saw him being bullied and neglected so you decide to step in and defend for him you have be...